2009-11-13_PERMIT FILE - C1982056A (7)

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Sedimentation Pond E controls runoff from a portion of the surface facilities, including the main coal stockpile area, prior to discharging to Foidel Creek. TCC will survey the pond per the previously outlined schedule. The same criteria will be used to determine if the pond requires cleaning. If so, the material will be removed and hauled to the refuse pile or pit for disposal. The pond is inspected during CDPS sampling and the v-notch weir is checked to determine if it is functioning correctly. Repairs are made on an as-needed basis. The pond is also inspected quarterly to assess the condition of the embankment and spillways and to determine if it is functioning correctly. Repairs are made on an as needed basis. The pond will be removed when it is no longer needed. The outlet works will be removed, the embankment pushed back into the pond excavation and final graded to blend with the surrounding terrain, and the area will be topsoiled and revegetated. Sedimentation Pond F receives runoff from the surface facilities, reclaimed surface mine, spoil springs, and underground mine discharge. TCC will survey the pond as per the previously outlined schedule. The same criteria will be used to determine if the pond requires cleaning. If so, the material will be removed and hauled to the refuse pile or pit for disposal. The pond is inspected during the periodic CDPS sampling, and the condition of the measuring device is checked. Repairs are made on an as-needed basis. The measuring device is a cutthroat flume located upstream of the road culvert. The weir, previously used to measure flows, did not function properly and required significant maintenance, so a 12-inch cutthroat flume was installed to assure accurate flow measurements. The pond will be removed when it is no longer needed. The outlet works will be removed, the rock in the emergency spillway may be reclaimed or placed in the pond basin, the embankment will be pushed in and graded to blend with the surrounding terrain, and the area will be topsoiled and revegetated. Sedimentation Pond G receives runoff from a part of the surface facilities and the reclaimed surface mine. TCC will survey the pond per the previously outlined schedule. The same criteria will be used to determine if the pond requires cleaning. If so, the material will be removed and hauled to the refuse pile or pit for disposal. The pond is inspected during the regular CDPS sampling and the flume is checked to deternne if it is functioning correctly. Any problems are noted and repairs made as-needed. Pond G is also an MSHA pond, subject to regular monthly inspections, except during the winter months. For the MSHA inspections, the outlet works and pond embankment are inspected, and any necessary repairs made in a timely basis. The pond will be removed when it is no longer needed. .The outlet works will be removed, the rock in the emergency spillway may be reclaimed or placed in the pond basin, the embankment will be pushed in and graded to blend with the surrounding terrain, and the area will be topsoiled and revegetated. Sedimentation Pond T receives runoff from the explosives magazine and storage yard areas. TCC will survey the pond per the previously outlined schedule. The same criteria will be used to determine if the pond requires cleaning. If so, the material will be removed and hauled to the refuse pile or pit for disposal. The pond is inspected during the CDPS sampling, and the weir is checked to see if it is working correctly. Any problems are noted and repairs made as needed. The pond will be removed when it is no longer needed. The outlet works will be removed, the rock in the emergency spillway may be reclaimed or placed in the pond basin, the embankment will be pushed in and graded to blend with the surrounding terrain, and the area will be topsoiled and revegetated. Other Impoundments Wad eSump - In order to provide for better drainage from the west ramp of the portal, the drainage system has been modified. The two culverts that carry water from the west ramp will be plugged, and the water will be diverted toward the Wadge sump. These culverts have been deleted from Map 24, but still exist in the field. Wadge sump. These culverts have been deleted from Map 24, but still exist in the field. Water will course to a small sediment dam which holds a 4-inch overflow pipe. Once the water reaches the top of the sediment dam, the water will enter the 4-inch overflow pipe and then drain to the sump. This system will aid in settling out some sediment from the water before it reaches the Wadge sump. From the sump, the water will be pumped up into Ditch D-2. Two water bodies, the Area 1 Pit Temporary Water Storage Basin and the Washplant I Thickener Overflow Sump, utilized in conjunction with ongoing mine water handling operations, have existed for years and were not previously identified or considered as "impoundments" under the regulatory definition. As a result of changes in regulatory interpretation, however, the CDMG has determined that these existing water bodies fall under the broad defmition of "impoundments" and should be identified and regulated as such. Because they are existing water TR09-66 2.05-78 04/11/09